license and fixes

1 files changed, 31 insertions, 0 deletions

diff --git a/main.c b/main.c
index 9f287a5..f47d043 100644
--- a/main.c
+++ b/main.c
@@ -1,3 +1,34 @@
+// USB HID test
+// Copyright (C) 2014 Florian Jung
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+
+/* Setup:
+
+   lfuse: 0xe0
+   hfuse: 0xd9
+
+   attach a 12MHz quartz to the atmega8, using the appropriate XTAL pins.
+
+   connect avr.PD{2,3} over 68 Ohm to usb.DATA{+,-}
+   connect usb.DATA{+,-} over 3v6-Z-Diode ( ----|<---- ) to GND
+   connect usb.DATA- over 1.5kOhm to usb.Vcc
+   connect usb.GND to avr.GND.
+*/
+
 #define F_CPU 12000000L
 
 #include <avr/io.h>